Drill steel guide



v Feb. 12, 1946. E. A. RICE DRILL STEEL GUIDE Filed Sept. 16, 1944 v j-hvenfar: 2) Edward dflzk'e.

v aw} Patented Feb. 12, 1946 ILL STEEL GUIDE "Edward A. Rice, 'Claremont, N. H., assignor to Sullivan-Machinery Company, a-corporation or r Massachusetts ltppiication September 16, 19451, Serial No. 554,516 'itcla im'sn (01. 255- 51) This in en i n elates to drill stee1 uides and more particularly to an improved guide for a drill steel of a mountedrock drill.

o ject of the present invention is to provi e-a imp r ilstee uide. :Another obiect i t pr vide an improvedguide for a drill t l f a mountedrock drill for guiding .the drill .bit during starting or spotting of a. hole. A further object is to provide an improyeddrill steel guide embodying apair of cooperating'guide arms-and-having improved means for rigidly lockring-the arms together in steel guiding position. d still f urtherobiect -is to provide an improved drill-Steel; guide which is of a comparatively rigid con struction and relatively simple in design. Other objects and advantages of. the invention will, however, hereinafter more ,fully appear.

in the accompanying drawing .there is shown for purposes of illustration'one "form which the invention may assume in practice.

In this drawing;

Fig, 1 is a fragmentary-side elevational view of the mounted rock drill equipped'with an illustrative form of :the improved drilLsteel guide.

Rig. Z -isa-fmnt-Jend elevational' view of the rock drillshown in Fig. ;1, showing the drill steel in cross section.

Fig. is a crossfisectionalview taken substan- -tiallyon'line 3-3 of- Fig. '1.

Fig.4.- is a horizontal sectional view-taken substantially .Qniine 4--4 of Fig. 1.

Fig. 5 is a plan view of the guide.

Fig. 6 is a-'view similar to Fig. 2, showing the guide arms in released, inch-guiding position. Figfl'is .a perspective view of the arm lock.

In this illustrative embodiment of the invention the improved drill steel guide is generally designated I, and is shown associated with a rock drill '2 of the mounted drifter type. It will be evident, however, that the guide may be associated with other types of rock drills.

The rock drill 2 is of a conventional design and includes a, usual guide shell 3 having longitudinal guideways 4 in which are slidingly received longitudinal guides 5 on the cylinder 6 of a hammer motor 1. Attached to the front end of the motor cylinder is a chuck housing 8 containing a usual chuck for receiving and supporting the shank of a conventional drill steel 9 carrying a drill bit Ill. The motor cylinder contains a usual reciprocable hammer piston which percussively actuates the drill steel during the drilling operation. Since the rock drill is of a well known construction, further illustration and description thereof are herein unnecessary.

Now referring to the improved drill steel guide I, it will be noted that attached as by parallel bolts ll, II to the front end of the guide shell .3 is a pair of frontand rear transverse plates [-2 and I3 maintained in longitudinally spaced-relation by spacing sleeves I4 interposed between the plates on the bolts. Pivotally mounted on the spacing sleeves between the transverse plates are the hubs I5 of a pair of cooperating guide arms "5,16. Thus the arms are pivoted onages parallel to the longitudinal axis of the drill steel, and swing in transverse planes. 'Ifhe-arm s have appropriately shaped guiding portions I'I, .l'l adapted to embrace the body of the drillsteel when the arms are moved together. Each arm has a lateral projection 18 at its inner side and when the arms are together, the-projection on each arm overlies the guiding portion of theother arm in the manner shown in Figs. 3 and 5, Each of the guiding portions I1 has an opening-19, and the projections I8 have openings 20 which are in registry with the openings l9, when the arms are together. A look 2| is provided for locking the arms together and this look is preferably formed of wire suitably bent into shape. This lock is generally of -U-shape and has a loop portion 2'2 and leg portions 23, the latter being insertible in the registering openings in the arms for rigidly locking the arms together. By arranging the openings IS, 20 in the manner shown each leg portion 23 of the lock engages both arms. The freeyends of the leg portions are outwardlybentas at '24 and are preferably beveled at their outer sides at 215. The bevels facili.- tate insertion 'of the leg portions into the arm openings and. the outwardly bent ends, when the lock is in locking position, preventeasy release of the legs from the openings. Accordingly, the lock serves as a spring clip and must be forced into and out of locking position.

The general mode of use of the improved drill steel guide will be clearly apparent from the description given. When the guide arms are swung about their pivots into the position shown in Figs. 2 and 3 and the. lock 2| is placed in locking position, the arms serve to guide the drill steel, thereby to center the drill bit during starting or spotting of a hole. The lock may be readily manually released simply by grasping the loop or cross portion of the U and withdrawing the leg portions from the arm openings, and the arms may then be swung downwardly into their released non-guiding position shown in Fig. 6. When the guide arms are in this released position, they are located out of the path of movement of the cylinder guides 5 so that the hammer motor may be fed forwardly along the guide shell past the guide.

As a result of this invention, it will be noted projections'and the guiding portions of the arms,

the latter may be rigidly locked together in guiding position. The U-shaped lock serves firmly to lock the arms together and may be readily released when desired. Other uses and advantages of the invention will be clearly apparent to those skilled in the art.

While there isin this application specifically described one form which the invention may as sume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and Letters Patent is:

1. 'In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing relative thereto in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms provided with projections, the projection on each arm overlapping a desire to secure by portion of the other arm when the arms are together. and the arms and said projections having registering openings, and a lock having portions receivable in said openings for lockingsaid arms together.

2. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said sup-port to swing relative thereto in transverse planes about'axes parallel to the longitudinal axis of the drill steel, each arm having openings which register with openings in the other arm when the arms are together, and a lockhaving portions receivable in said openings for locking said arms together. 7

3. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms having guiding portions which embrace the body of a drill steel when the arm's are together, and a lock having spaced portions each engagea'ble [concurrently with both of said guiding portions for locking said arms together in guiding position. i

4. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms having guiding portions and projections, the projection on each arm overlapping the guiding portion of the other arm when said arms are together, said projections and said guiding portions having registering openings, and a lock 7 having portions receivable, in said openings for locking said arms together.

5. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing relative thereto in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms provided with portions which overlap when the arms are together, said overlapping portions having registering openings, and a lock having portions receivable in said openings for locking said arms together.

6. In adrill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support toswing in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms provided with portions which overlap when said arms are together, said portions having registering openings, and a U-shaped lock having leg portions concurrently receivable in said openings for locking said arms together position. 7 a

7. In a drillsteel guide, a support, a pair of cooperating guide arms pivotally mounted on said support'to swing in transverse planes about axes parallel to'the longitudinal axis of the drill steel, said arms provided with portions which overlap when said arms are together, said overlapping portions having registering openings, and a U- shaped lock having leg portions receivable in said openings for locking said arms together, said leg portions being laterally bent at their free ends so that they spring laterally upon insertion in said openings, and said bent portions when they pass through said openings serving to hold said lock' in position. I 8. In a drill steel guide, a'suppo-rt,a pair of cooperating guide arms pivotally mounted on said support to swing in transverse planes about axes parallel to the longitudinal axis of the drill steel, said arms-provided with portions which overlap when said arms are together, said overlapping portions having registering openings, and'aU- shaped lock having leg portions receivable in said openings for locking said arms together,said leg portions being beveled to facilitate insertion thereof in said openings. v v EDWARD A. RICE.

in guiding 1 

